- fricative, sibilant, spirant - of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')
Antonym: hard (indirect, via soft)
- sibilant, sibilant consonant - a consonant characterized by a hissing sound (like s or sh)
--1 is a kind of consonant
Derived forms: verb sibilate3, verb assibilate1, verb assibilate2, verb sibilate1, verb sibilate2